Abstract

A series of magnetically focused, electronographic image converters has been developed for use in far-uv photography and spectroscopy. The use of internal reflecting optics has enabled full advantage to be taken of the very high quantum yields of front-surface alkali halide photocathodes, resulting in over-all detection efficiencies a factor of 10 to 30 higher than similar systems using SC-5 film. An all-reflecting objective spectrograph using this system with Schwarzchild optics has been constructed for obtaining stellar spectra in the 1000-1400-Å wavelength range, as well as a similar system based on Schmidt type optics for stellar spectroscopy in the 1230-2000-Å wavelength range. Also, smaller Schmidt type instruments have been developed for direct stellar photography in the far uv.

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Author Affiliations

George R. Carruthers

The author is with the E. O. Hulburt Center for Space Research, Naval Research Laboratory, Washington, D.C. 20390.

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